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I suppose, Steven, that I just consider nature to be the ensemble of subject, glasses, and any other accessories that happen to be included in the portrait. It's easy to explain away a lack of a refractive offset by hypothesizing that the eyeglass prescription is a relatively mild one. I only brought it up because Jeff's self-portrait maximizes my expectations of seeing the effect: a strong contour seen through the margin of the lens. Since I know how it usually looks, I've come to expect to see it; and if I don't see it I wonder why.
A few weeks ago I did sixteen rapid mirror self-portraits in an afternoon, so, after reading your post, I went and looked at them to see how I handled this. I regret to report that in every instance I avoided the issue by doing a relatively straight-ahead view. Not a single one has a strong vertical contrast behind a lens margin. I wasn't aware of deliberately avoiding the issue, but who knows? I guess the best advice is to be aware of the situations where the refractive offset phenomenon is likely to occur and either avoid them or deal with it on a case-by-case basis.
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